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EP0698141B1 - Procede de controle du depot d'impuretes adhesives provenant de suspensions de pate a papier - Google Patents

Procede de controle du depot d'impuretes adhesives provenant de suspensions de pate a papier Download PDF

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Publication number
EP0698141B1
EP0698141B1 EP94916917A EP94916917A EP0698141B1 EP 0698141 B1 EP0698141 B1 EP 0698141B1 EP 94916917 A EP94916917 A EP 94916917A EP 94916917 A EP94916917 A EP 94916917A EP 0698141 B1 EP0698141 B1 EP 0698141B1
Authority
EP
European Patent Office
Prior art keywords
paper
stickies
weight
pulp
paper stock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94916917A
Other languages
German (de)
English (en)
Other versions
EP0698141A1 (fr
Inventor
Klaus Hornfeck
Bernhard Nellessen
Udo LÜCK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nopco Paper Technology Holding AS
Original Assignee
Henkel AG and Co KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP0698141A1 publication Critical patent/EP0698141A1/fr
Application granted granted Critical
Publication of EP0698141B1 publication Critical patent/EP0698141B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control

Definitions

  • the invention relates to a method for controlling the settling of sticky contaminants from pulp suspensions in papermaking.
  • stickies In the field of processing waste paper, sticky contaminants, commonly referred to as stickies , can significantly disrupt the production process and negatively affect the quality of the paper produced.
  • the stickies get into the paper manufacturing process if the used paper contains glue spots, adhesive tapes or finished products such as coated, laminated or coated papers or cardboards.
  • the resin of the wood and its interaction with paper auxiliaries can form adhesive contaminations.
  • the stickies are in a compact form, they can be removed relatively easily mechanically with the help of sorting machines. As a rule, the stickies are not only available in a compact form, they are also contained in dispersed form in the pulp and are very difficult to remove in this form. Recently, therefore, the increasing use of waste paper in paper production and the narrowing of the water cycles have led to an increasing increase in the proportion of stickies in the circulating water.
  • Stickies not only cause a number of problems or faults in paper production, but also in paper processing. Because of their stickiness, deposits form on machine parts, pipe walls, screens, wet felts, dry felts, drying cylinders, smoothing rollers, calender rollers and, moreover, also in the finished paper, which causes web breaks in the paper machine and a deterioration in paper quality due to holes, stains, markings (see HL Baumgarten, Das Textil, 1984, 38 , Issue 10A, pp. V121 - V125 ). HL Baumgarten notes that sticky contaminants in industry and institute publications has been called the biggest problem of waste paper recycling for years. Even minimal amounts of glue can still tear on paper and printing machines, making cleaning stoppages necessary. Baumgarten explains: "If 2 g of adhesive is applied to a well-chosen point in the paper machine, several 100 kg of paper can be rejected" (op. Cit., Page V122, right column).
  • stickies come from the resin of wood, aids in paper production, binders for painting paper and cardboard, adhesives for paper processing, printing ink binders and materials for paper processing. Of particular importance in the context of the task of the present invention are those adhesive contaminants that come from the resin of the wood and the adhesives used in paper processing.
  • the resins present in the pulp and wood pulp contain about 1 - 5% by weight of so-called harmful resins. These can be in a colloidal unbound form or adhere to the paper fibers.
  • harmful resins can be in a colloidal unbound form or adhere to the paper fibers.
  • the adhesives used in paper processing can be divided into three groups: the pressure sensitive adhesives, the dispersion adhesives and the hot melt adhesives.
  • the pressure sensitive adhesives are permanently adhesive and permanently adhesive products. Adhesion is achieved by pressing the surfaces of the parts to be bonded.
  • a large number of base materials in combination with corresponding additives, e.g. tackifying resins, plasticizers or antioxidants.
  • Typical base polymers include Natural rubber, butyl rubber, styrene-butadiene copolymers (SBR rubber), acrylonitrile copolymers, polychloroprene, polyisobutylene, polyvinyl ether, acrylates, polyesters, polyurethanes, silicones.
  • the polymers which are suitable for forming the adhesive layer are present as solid particles in an aqueous dispersion medium.
  • the base monomers are first emulsified in an aqueous phase and then polymerized therein, a technique known as emulsion polymerization.
  • the polymer is then in the form of small particles with different particle sizes, which can vary in the range from molecularly disperse to coarsely disperse.
  • an aggregation and an associated sedimentation of the polymer particles are counteracted by adding protective colloids or emulsifiers to the system.
  • hot melt adhesives also called “hot melts”
  • thermoplastics These substances have the property of softening when heated, which makes them flowable. When they cool down, they solidify again.
  • polymers which are used as hot-melt adhesives include polyamides, copolyamides, polyaminoamines, saturated polyesters and ethylene-vinyl acetate copolymers.
  • Primary stickies are understood to mean those sticky contaminants, which due to their high resistance to wet grinding not be dispersed. They are therefore in a compact form and are easy to excrete.
  • the existence of the secondary stickies stems from the fact that the adhesive impurities are subject to a change in their particle size in the course of the waste paper processing, which is caused by thermal, chemical and mechanical influences. This means that even impurities that are still in a rather coarse form at the beginning of the reprocessing can be reduced to a greater or lesser extent in the reprocessing of waste paper.
  • the processes in the hot shredder of waste paper processing result in dispersion of sticky contaminants.
  • stickies with a low melting point are liquefied and then finely dispersed. Even crumbly or brittle stickies break down into very small particles.
  • the particle size of the dispersed stickies then ranges from coarse to colloidal to molecular.
  • Van der Waals forces Small solid particles that touch each other or between which there is a very small distance attract each other due to molecular interactions, the so-called Van der Waals forces.
  • the Van der Waals forces working on an agglomeration come in an alkaline environment - i.e. the environment typical for waste paper processing - but generally not to the advantage, since the particles are surrounded by an electrical double layer, which is responsible for the mutual repulsion of the particles charged in the same direction.
  • the paper machine is usually used in a neutral or slightly acidic environment, which reduces the repulsive negative forces.
  • drainage or retention aids The drainability of the pulp suspensions that were made using waste paper is generally poor. In practice, aids are therefore often used, which are referred to as drainage or retention aids.
  • retention agents as substances that bind fine fibers and fillers to the long paper fibers (long fibers). This binding of the short fibers and the fillers to the long fibers prevents a kind of fleece formation of the fine materials, which makes dewatering of the paper pulp suspension difficult. In this way, retention agents improve the drainability by binding the fine substances to the long fibers.
  • the retention aids can be divided into three groups. A distinction is made between inorganic products such as aluminum sulfate or sodium aluminate, synthetic products such as polyethyleneimines, polyamines or polyacrylamides and modified natural products such as cationic starch.
  • the mode of action of the retention agents is based on the deposition of fine substances and fillers on the paper fibers.
  • An important mechanism is that polyelectrolytes with sufficient chain length can bridge the distance between two particles and thus cause agglomerate formation.
  • cationic polyelectrolytes for example cationic starch, are suitable as scavengers for anionic contaminants ( Trentblatt für Textilfabrikation 1993, pages 163-170 ).
  • the object of the present invention was therefore to develop a method for controlling the settling of adhesive contaminants which appear negatively in the paper machine as secondary stickies.
  • This method should generally be applicable to a wide variety of types of adhesive contaminants, but especially to pressure sensitive adhesives, dispersion adhesives and hot melt adhesives.
  • the sticky control it had to be demanded that the sticky control not be at the expense of increased losses of fibers and fillers.
  • the solution of this object is achieved according to the invention by a method for controlling the deposition of stickies from paper stock suspensions in papermaking, with the paper stock suspension immediately before the first and / or further flotation stages, based on otro paper stock, 0.2 to 3.0% by weight of water glass and / or 0.05 to 1.0% by weight. -% of a fatty acid with essentially 12 to 22 carbon atoms or its salt with mono- to trivalent cations added.
  • otro paper stock is understood to mean, as is customary in paper technology, oven-dry paper stock.
  • the present invention therefore relates to a process for controlling the settling of adhesive contaminants from paper pulp suspensions during paper manufacture, which is characterized in that the paper pulp suspension is - immediately before the first and / or further flotation stages - based on otro pulp - 0 , 2 to 3.0% by weight of water glass and / or 0.05 to 1.0% by weight of a fatty acid with essentially 12 to 22 carbon atoms or its salt with mono- to trivalent cations.
  • components i) and / or ii) are added is a critical feature for the success of the process according to the invention.
  • the fact that components i) and / or ii) are to be added immediately before the first and / or further flotation stages implies that they get into the flotation without being subjected to strong shear forces beforehand. Such shear forces occur at various points in the course of papermaking. Examples of this are the waste paper pulp, the so-called pulper, or the sorting devices connected to it.
  • the paper stock suspensions used are made from waste paper or paper products which contain waste paper components.
  • the type of water glass is not critical in itself. However, soda and / or potassium water glass are preferred.
  • a mixture of components i) and ii) is used.
  • the weight ratio of the two components is not critical per se, but it is preferred to set a weight ratio of 0.5: 1 to 10: 1. Again, it is preferred to use component i) in excess compared to component ii); a weight ratio of components i) and ii) of 3: 1 to 5: 1 is very particularly preferred.
  • the two components i) and ii) are used in combination with an alkali metal hydroxide.
  • the alkali hydroxide preferably sodium and / or potassium hydroxide, is preferably used in an amount of 0.05 to 2.0% by weight, based on the dry paper stock.
  • the presence of alkali hydroxide further reduces the loss of fibers and fillers, which is of great importance for the economics of the process.
  • component ii) it is crucial that it is present, at least in part, in the respective flotation cell in the form of a relatively poorly soluble soap. This is usually achieved by using a fatty acid with 12 to 22 carbon atoms or its soluble salts with 1- to 3-valent cations, which then form the corresponding poorly soluble calcium soaps in situ with the water hardness in the system. If the water hardness is not sufficient, the calcium soaps of fatty acids with 12 to 22 carbon atoms can also be used directly.
  • cationic polymers such as polyacrylamides, polyethyleneimines, polyamide amines or cationic starches and inorganic compounds such as aluminum sulfate.
  • the method according to the invention is generally applicable to a wide variety of types of adhesive contaminants. However, it is particularly suitable for solving the problems caused by pressure-sensitive adhesives, dispersion adhesives and hotmelt adhesives.
  • the method according to the invention is suitable in principle for checking the setting and sticking of stickies of different types and thus also of different chemical and physico-chemical nature.
  • the advantages of the method according to the invention are particularly evident in the case of stickies based on pressure-sensitive adhesives and hotmelt adhesives.
  • Sodium hydroxide solution 50% aqueous NaOH solution.
  • Water glass “Water glass 37/40” (Na 2 SiO 3 ), Henkel / Düsseldorf. 042: Oleic acid mixture; “Olinor 042", Henkel / Düsseldorf.
  • the dichloromethane extract served as an indirect measure for determining the proportion of adhesive contaminants in paper suspensions. This is obtained by filtering a sample of the paper stock suspension to be investigated, drying the residue and determining the constituents soluble in dichloromethane, which are essentially adhesive contaminants, by extraction.
  • a 500 ml sample was taken from a well-mixed paper stock suspension and passed through a filtering device consisting of a 15 cm diameter Büchner funnel, a large suction bottle and a circular paper filter. filtered. After the filtration, it was checked visually in each case whether the filtrate had no turbidity. If turbidity could still be seen, the filtrate was filtered again using the same filter. The round filter was dried together with the filtered cake in the warming cabinet and then weighed.
  • waste paper was pulpered at a consistency of 12 otro with 1% water glass, 0.5% sodium hydroxide solution, 0.5% hydrogen peroxide and 0. 33% Olinor 042 - all percentages related to otro paper stock - opened. After the subsequent rough sorting, a volume corresponding to 200 kg of dry paper was pumped into a chest and, after determining the consistency, diluted to 1.3% consistency with circulating water.
  • the additives to be investigated were then metered in, a fabric sample was taken and the flotation was then carried out for 30 minutes.
  • the pulp suspension circulated from the chest over the flotation cell to a subsequent second chest back to the first chest. After the end of the flotation, the entire amount of material was pumped back into the first chest and another sample was taken. From the samples obtained before and after the flotation, the dichloromethane extract is determined, as indicated above, and the total loss of filler and fibers is determined via the consistency and the level of the laid paper.
  • Table 1 added additive 1) Reduction of DCM extract (%) Total loss 3) (%) without addition 33 18th 1% water glass 2 ) 39 17th 1% water glass 57 14 1% water glass + 0.07% 042 65 11 1% water glass + 0.5% NaOH + 0.07% 042 64 8th 1) The addition took place immediately before the flotation as described above. 2) The addition was made here for comparison purposes in the pulper 3) Loss of fibers and filler

Landscapes

  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Claims (6)

  1. Procédé de contrôle du dépôt des impuretés adhésives provenant de suspensions de pâte à papier lors de la fabrication du papier, caractérisé en ce que l'on ajoute à la suspension de pâte à papier, chaque fois immédiatement avant la première étape et/ou avant les étapes ultérieures de flottation - par rapport à la "pâte à papier otro"
    i) 0,2 à 3,0 % en poids de verre soluble et/ou
    ii) 0,05 à 1,0 % en poids d'un acide gras comportant essentiellement 12 à 22 atomes de C, ou de son sel avec des cations mono- à trivalents.
  2. Procédé selon la revendication 1, caractérisé en ce que les suspensions de pâte à papier utilisées ont été confectionnées à partir de vieux papiers ou de produits de papier, qui contiennent des constituants de vieux papiers.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on met en oeuvre les deux composants i) et ii).
  4. Procédé selon la revendication 3, caractérisé en ce que l'on met en oeuvre les deux composants i) et ii) dans un rapport pondéral de 0,5:1 à 10:1.
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que l'on met en oeuvre les composants i) et ii) en association avec un hydroxyde de métal alcalin.
  6. Procédé selon une des revendications 1 à 5, caractérisé en ce que l'on réalise le procédé en plus en présence d'un agent de floculation ou de rétention cationique.
EP94916917A 1993-05-10 1994-05-02 Procede de controle du depot d'impuretes adhesives provenant de suspensions de pate a papier Expired - Lifetime EP0698141B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4315449A DE4315449A1 (de) 1993-05-10 1993-05-10 Verfahren zur Kontrolle des Absetzens klebender Verunreinigungen aus Papierstoff-Suspensionen
DE4315449 1993-05-10
PCT/EP1994/001389 WO1994026973A1 (fr) 1993-05-10 1994-05-02 Procede de controle du depot d'impuretes adhesives provenant de suspensions de pate a papier

Publications (2)

Publication Number Publication Date
EP0698141A1 EP0698141A1 (fr) 1996-02-28
EP0698141B1 true EP0698141B1 (fr) 1997-03-12

Family

ID=6487641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94916917A Expired - Lifetime EP0698141B1 (fr) 1993-05-10 1994-05-02 Procede de controle du depot d'impuretes adhesives provenant de suspensions de pate a papier

Country Status (10)

Country Link
EP (1) EP0698141B1 (fr)
JP (1) JPH08509789A (fr)
AT (1) ATE150119T1 (fr)
CA (1) CA2162668A1 (fr)
DE (2) DE4315449A1 (fr)
DK (1) DK0698141T3 (fr)
ES (1) ES2098951T3 (fr)
FI (1) FI955377L (fr)
GR (1) GR3023487T3 (fr)
WO (1) WO1994026973A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996030585A1 (fr) * 1995-03-30 1996-10-03 Nissin Kagaku Kenkyusho Co., Ltd. Agent de regulation de resine et procede permettant d'eviter les difficultes dues a la resine
DE19519268C1 (de) * 1995-05-31 1997-01-23 Stockhausen Chem Fab Gmbh Verwendung von Mitteln zur Zellstoff- und Papierherstellung
DE19806732A1 (de) * 1998-01-23 1999-07-29 Voith Sulzer Papiertech Patent Verfahren zur Entfernung von feinen Verunreinigungen aus einer Faserstoffsuspension
DE59811388D1 (de) * 1998-09-22 2004-06-17 Alfred Pohlen Verfahren zur Eliminierung von klebrigen Verunreinigungen aus aufbereitetem Altpapier enthaltende Papierbreie mittels hydrophobierten Mineralien
JP5875206B2 (ja) 2014-03-11 2016-03-02 栗田工業株式会社 紙の製造方法及びピッチ除去剤

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2856845A1 (de) * 1978-12-30 1980-07-17 Henkel Kgaa Verfahren zum deinken von bedrucktem altpapier

Also Published As

Publication number Publication date
JPH08509789A (ja) 1996-10-15
ATE150119T1 (de) 1997-03-15
EP0698141A1 (fr) 1996-02-28
FI955377A0 (fi) 1995-11-08
FI955377A7 (fi) 1995-11-08
FI955377L (fi) 1995-11-08
WO1994026973A1 (fr) 1994-11-24
DK0698141T3 (da) 1997-10-13
DE4315449A1 (de) 1994-11-17
CA2162668A1 (fr) 1994-11-24
GR3023487T3 (en) 1997-08-29
DE59402082D1 (de) 1997-04-17
ES2098951T3 (es) 1997-05-01

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